core: New function gpgme_op_setownertrust

* src/Makefile.am (main_sources): Add new file.
* src/context.h (ctx_op_data_id_t): Add OPDATA_SETOWNERTRUST.
* src/engine.c, src/engine.h (_gpgme_engine_op_setownertrust): New.
* src/engine-backend.h (engine_ops): Add 'setownertrust' and adjust all
engine initializers.
* src/engine-gpg.c (gpg_setownertrust): New.
(_gpgme_engine_ops_gpg): Set setownertrust to gpg_setownertrust.
* src/gpgme.h.in (gpgme_op_setownertrust_start, gpgme_op_setownertrust):
New.
* src/gpgme.def, src/libgpgme.vers: Add new functions.
* src/setownertrust.c: New.

* doc/gpgme.texi: Document new functions.

* tests/Makefile.am (noinst_PROGRAMS): Add new test program.
* tests/run-setownertrust.c: New.

* tests/gpg/Makefile.am (c_tests): Add new file. (LDADD): Add
@GPG_ERROR_LIBS@.
* tests/gpg/t-setownertrust.c: New.
* tests/gpg/t-support.h (have_gpg_version): New.

--

This extends GPGME to support the --quick-set-ownertrust command added
by GnuPG 2.4.6. This allows changing the owner trust of keys and
enabling/disabling keys without using the editinteractor interface.

GnuPG-bug-id: 7239

1 files changed, 127 insertions, 0 deletions

diff --git a/tests/run-setownertrust.c b/tests/run-setownertrust.c
new file mode 100644
index 00000000..4ed2bf98
--- /dev/null
+++ b/tests/run-setownertrust.c
@@ -0,0 +1,127 @@
+/* run-setownertrust.c  - Test tool to perform ownertrust changes
+ * Copyright (C) 2024 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <https://gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+/* We need to include config.h so that we know whether we are building
+   with large file system (LFS) support. */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <gpgme.h>
+
+#define PGM "run-setownertrust"
+
+#include "run-support.h"
+
+
+static gpg_error_t
+status_cb (void *opaque, const char *keyword, const char *value)
+{
+  (void)opaque;
+  fprintf (stderr, "status_cb: %s %s\n", nonnull(keyword), nonnull(value));
+  return 0;
+}
+
+
+static int
+show_usage (int ex)
+{
+  fputs ("usage: " PGM " [options] USERID VALUE\n"
+         "Options:\n"
+         "  --status         print status lines from the backend\n"
+         , stderr);
+  exit (ex);
+}
+
+
+int
+main (int argc, char **argv)
+{
+  int last_argc = -1;
+  gpgme_error_t err;
+  gpgme_ctx_t ctx;
+  gpgme_protocol_t protocol = GPGME_PROTOCOL_OpenPGP;
+  int print_status = 0;
+  const char *userid;
+  const char *value;
+  gpgme_key_t key;
+
+  if (argc)
+    { argc--; argv++; }
+
+  while (argc && last_argc != argc )
+    {
+      last_argc = argc;
+      if (!strcmp (*argv, "--"))
+        {
+          argc--; argv++;
+          break;
+        }
+      else if (!strcmp (*argv, "--help"))
+        show_usage (0);
+      else if (!strcmp (*argv, "--status"))
+        {
+          print_status = 1;
+          argc--; argv++;
+        }
+      else if (!strncmp (*argv, "--", 2))
+        show_usage (1);
+    }
+
+  if (argc != 2)
+    show_usage (1);
+  userid = argv[0];
+  value = argv[1];
+
+  init_gpgme (protocol);
+
+  err = gpgme_new (&ctx);
+  fail_if_err (err);
+  gpgme_set_protocol (ctx, protocol);
+  gpgme_set_armor (ctx, 1);
+  if (print_status)
+    {
+      gpgme_set_status_cb (ctx, status_cb, NULL);
+      gpgme_set_ctx_flag (ctx, "full-status", "1");
+    }
+
+  err = gpgme_get_key (ctx, userid, &key, 0);
+  if (err)
+    {
+      fprintf (stderr, PGM ": error getting public key for '%s': %s\n",
+               userid, gpg_strerror (err));
+      exit (1);
+    }
+  err = gpgme_op_setownertrust (ctx, key, value);
+  if (err)
+    {
+      fprintf (stderr, PGM ": gpgme_op_setownertrust failed: %s\n",
+               gpg_strerror (err));
+      exit (1);
+    }
+  gpgme_key_unref (key);
+
+  gpgme_release (ctx);
+  return 0;
+}